062. A Few Ways to Detect a Dumping Tool from a Ransomware Gang's Toolset

Hello everyone! Today we'll look at another tool from a ransomware gang's toolkit. It's called MiniDump, and it enables adversaries to dump LSASS or any other process.


Let's look at a few detection opportunities. The tool drops and loads a driver with the following name  - kxxxxxxx.sys. It means we can search for creation events related to it:

event_type: "filecreate" 

AND 

file_name: "kxxxxxxx.sys"

MiniDump also creates a service with the same name - another detection opportunity:

event_type: "serviceuninstallwin"

AND

service_name: "kxxxxxxx.sys"

Finally, the tool loads the driver:

event_type: "driverloadwin" 

AND

file_name: "kxxxxxxx.sys"

AND

file_sig: "DFOCUS Co., Ltd"

Interesting enough that the driver name is the same as in the EDR killer advertised some time ago by threat actor with moniker "r1z".

See you tomorrow!

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